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Old 5th January 2006, 12:59 PM   #1
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Exclamation Marshall vs65r blowing fuses

Hi people and happy new year to you.
This amp first behaved like this: it wouldn't give out sound until the volume knob was all the way on 5 or so, but when one reached 5 it came on hard, i fear maybe to stressfull on the speaker. Anyway, I plugged my bass guitar into it (it is a guitar amp btw) the other day and obviusly fried something, because the amp now doesn't work at all. It blows a fuse every time I replace one.
I am skilled with soldering iron, but haven't repaired amps yet. I have built some however.
If someone could help with a suggestion of what might be wrong with it, or how to detect the fault I would greatly appreciate it.
-the amp is a ss 65w with a tube in the preamp
-the speaker shows a healthy 6-7 ohms resistance
-I'm including links to schematics
http://www.drtube.com/schematics/mar...65-60-02-1.gif
http://www.drtube.com/schematics/mar...65-60-02-2.gif
http://www.drtube.com/schematics/mar...vs65-61-02.gif
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Old 5th January 2006, 01:32 PM   #2
testlab is offline testlab  United States
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Location: Grand Rapids MI
Sounds like bad solder joints. Check any large resistors or radial lead capacitors. Also check the jacks. Component heating can cause solder joints to soften and fracture.
You may need magnification to see solder fractures.
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Old 28th December 2013, 05:00 PM   #3
marfu is offline marfu  Brazil
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Default socket tube

Quote:
Originally Posted by davorinjo View Post
Hi people and happy new year to you.
This amp first behaved like this: it wouldn't give out sound until the volume knob was all the way on 5 or so, but when one reached 5 it came on hard, i fear maybe to stressfull on the speaker. Anyway, I plugged my bass guitar into it (it is a guitar amp btw) the other day and obviusly fried something, because the amp now doesn't work at all. It blows a fuse every time I replace one.
I am skilled with soldering iron, but haven't repaired amps yet. I have built some however.
If someone could help with a suggestion of what might be wrong with it, or how to detect the fault I would greatly appreciate it.
-the amp is a ss 65w with a tube in the preamp
-the speaker shows a healthy 6-7 ohms resistance
-I'm including links to schematics
http://www.drtube.com/schematics/mar...65-60-02-1.gif
http://www.drtube.com/schematics/mar...65-60-02-2.gif
http://www.drtube.com/schematics/mar...vs65-61-02.gif

Man the problem is socket tube.
Replace by other ( high quality socket).
bye
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Old 28th December 2013, 10:32 PM   #4
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do you have the ability and equipment to check for shorted transistors in the output?
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Old 28th December 2013, 11:57 PM   #5
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Location: Coffs Harbour, on the east coast
Guys, you are replying to a request for repair advice that was posted eight years ago. Are you sure the OP is still waiting for help to fix the amplifier?
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Old 29th December 2013, 12:57 AM   #6
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i guess in my zeal to help i neglected to look at the date!
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